The markets turned negative during the midday with the Dow losing 43 points to 16,400 as earnings disappointed. Nasdaq slipped 6 points to 4349.

On the upside

Stratasys (Nasdaq: SSYS) narrowed second quarter losses as revenue climbed prompting the 3D printer maker to lift its full year outlook.

Priceline (Nasdaq: PCLN) expanded its commercial agreement with Ctrip.com International (Nasdaq: CTRP) and will invest $500 million in Ctrip.

Shares of T2 Biosystems (Nasdaq: TTOO) soared in its market debut.

On the downside

PhotoMedex (Nasdaq: PHMD) fell to a greater than expected loss for the second quarter as revenue dropped.

Roundy's (NYSE: RNDY) fell to an unexpected loss for the second quarter.

SandRidge Energy (NYSE: SD) reported lower second quarter earnings and revenue prompting a downgrade.

In the broad market, declining issues outpaced advancers by a margin of nearly 5 to 4 on the NYSE and by more than 5 to 3 on Nasdaq. The broader S&P 500 lost 4 points to 1915. Bitcoin rose $5 to $586.